4. Boring or penetrating the earth
  5. With below-ground tool drive prime mover
  6. Plural below-ground drive prime movers

Tone Boring Co., Ltd.

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Air pressure impact drilling method and apparatus for same

Tool driving or impacting – Hammer or tool shaft reciprocated by gripping means which... – With fixed means cyclically contacted by grip structure
Patent

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Trench excavator

Boring or penetrating the earth – With below-ground tool drive prime mover – Plural below-ground drive prime movers
Patent

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Profile ID: LFUS-PAI-P-1097426

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